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Add SP804 delay timer driver

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Add a delay timer driver for the ARM SP804 dual timer.

This driver only uses the first timer, called timer 1 in the
SP804 Technical Reference Manual (ARM DDI 0271D).

To use this driver, the BSP must provide three constants:

*   The base address of the SP804 dual timer
*   The clock multiplier
*   The clock divider

The BSP is responsible for calling sp804_timer_init(). The SP804
driver instantiates a constant timer_ops_t and calls the generic
timer_init().

Change-Id: I49ba0a52bdf6072f403d1d0a20e305151d4bc086
Co-authored-by: Dan Handley <dan.handley@arm.com>
This commit is contained in:
Ryan Harkin 2015-03-17 14:52:39 +00:00 committed by Dan Handley
parent 9055c7d149
commit cc58b2d0f5
2 changed files with 126 additions and 0 deletions
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79
drivers/arm/sp804/sp804_delay_timer.c Normal file
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/*
* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#include <assert.h>
#include <delay_timer.h>
#include <mmio.h>
uintptr_t sp804_base_addr;
#define SP804_TIMER1_LOAD (sp804_base_addr + 0x000)
#define SP804_TIMER1_VALUE (sp804_base_addr + 0x004)
#define SP804_TIMER1_CONTROL (sp804_base_addr + 0x008)
#define SP804_TIMER1_BGLOAD (sp804_base_addr + 0x018)
#define TIMER_CTRL_ONESHOT (1 << 0)
#define TIMER_CTRL_32BIT (1 << 1)
#define TIMER_CTRL_DIV1 (0 << 2)
#define TIMER_CTRL_DIV16 (1 << 2)
#define TIMER_CTRL_DIV256 (2 << 2)
#define TIMER_CTRL_IE (1 << 5)
#define TIMER_CTRL_PERIODIC (1 << 6)
#define TIMER_CTRL_ENABLE (1 << 7)
/********************************************************************
* The SP804 timer delay function
********************************************************************/
uint32_t sp804_get_timer_value(void)
{
return mmio_read_32(SP804_TIMER1_VALUE);
}
/********************************************************************
* Initialize the 1st timer in the SP804 dual timer with a base
* address and a timer ops
********************************************************************/
void sp804_timer_ops_init(uintptr_t base_addr, const timer_ops_t *ops)
{
assert(base_addr != 0);
assert(ops != 0 && ops->get_timer_value == sp804_get_timer_value);
sp804_base_addr = base_addr;
timer_init(ops);
/* disable timer1 */
mmio_write_32(SP804_TIMER1_CONTROL, 0);
mmio_write_32(SP804_TIMER1_LOAD, UINT32_MAX);
mmio_write_32(SP804_TIMER1_VALUE, UINT32_MAX);
/* enable as a free running 32-bit counter */
mmio_write_32(SP804_TIMER1_CONTROL,
TIMER_CTRL_32BIT | TIMER_CTRL_ENABLE);
}

47
include/drivers/arm/sp804_delay_timer.h Normal file
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/*
* Copyright (c) 2015, ARM Limited and Contributors. All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
*
* Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
*
* Neither the name of ARM nor the names of its contributors may be used
* to endorse or promote products derived from this software without specific
* prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*/
#ifndef __SP804_DELAY_TIMER_H__
#define __SP804_DELAY_TIMER_H__
#include <delay_timer.h>
#include <stdint.h>
uint32_t sp804_get_timer_value(void);
void sp804_timer_ops_init(uintptr_t base_addr, const timer_ops_t *ops);
#define sp804_timer_init(base_addr, clk_mult, clk_div) \
sp804_timer_ops_init((base_addr), &(const timer_ops_t) \
{ sp804_get_timer_value, (clk_mult), (clk_div) })
#endif /* __SP804_DELAY_TIMER_H__ */